It's finished! It's now available for free here: Culver Design Patterns
This is super niche, honestly I'm not sure how many people would be interested. I designed this padded amp cover for my Marshall DSL40C when I found that A: padded amp covers are very expensive, and B: The affordable covers were not very durable and were quite thin. My cat's favorite thing is laying on top of this amp, so I wanted something that cat hair wouldn't stick to and be somewhat resistant their their pointy little claws. The cover is made using cotton canvas, it also has a soft fluffy batting inner layer, a cotton lining, and opening for access to the top handle. It's a fairly simple design, but does have some slightly involved steps including binding the inside edge of a rectangular opening. But anyone with some sewing experience should be able to manage.
I'm working on the downloadable pattern right at the moment. Hopefully it can help some musician out there. My version is incredibly simple looking, but it could easily be customized using different fabrics, paint, or art applique. But I had this particular cotton canvas on-hand and and it only cost me my time.